Broken Sign Blog
#027: Rail Pool (Forgetful)
4 August 2022This is by far the hardest Rail Pool (or puzzle in general) I’ve constructed to date. The break-in requires some very intricate logic and the rest of the puzzle isn’t all smooth sailing either. I really enjoy this variant though, so I’ll probably make some easier forgetful Rail Pools at some point.
Rules: Draw a non-intersecting loop through the centres of all cells. Some boldly outlined regions contain number clues. If a straight loop segment visits any cells of a clued region, its length must match one of these numbers. Each number must correspond to at least one such loop segment. Question marks represent any positive integer, but numbers cannot repeat within a region.
Variant: Forgetful — The loop omits exactly one cell in each region.